If its under powered than no amount of delaying the reveal is going to control the damage. it is bound to happen, like it did with Xbox one and PS4.
That's a massive over-simplification. The real damage with Xbox One's reveal happened because of the combination of the DRM it was originally supposed to have, a general lack of information on games it was going to have (beyond just some generic-looking Call of Duty entry), the forced inclusion of Kinect, a high price, and Microsoft displaying a dismissive attitude towards its own core audience. The fact that the system was less powerful than the PS4 didn't even emerge until a few weeks later, and was small potatoes when compared to the aforementioned issues.